I don't know that I personally believe this to be the case, but it is possible that McNeill was told to check into that hotel under an assumed name and to wait for further instructions. The contact could have been in the form of an in room call, a note slid under the door, or instructions left somewhere in the hotel detailing what his next step should be. As we know, this is an underground operation, and the players would attempt to be as secretive as possible, and to set up a trail so complicated it would be difficult to follow. It is possible there would be multiple steps the holder of the child would have to follow, much like the various steps taken to hide abused women and children from their abusers.
http://www.actioncenter.polarisproject.org/learn/human-trafficking-101
"Who Are the Facilitators?
Facilitators include a wide range of individuals, organizations, businesses and corporations, internet sites and practices. What all facilitators have in common is that they enable or support the trafficking industry. Facilitators may include:
Landlords
Hotels and motels
Transportation companies
Advertisers
Banks and financial services corporations
In some cases, facilitators are aware of their involvement in human trafficking, and the profits they generate outweigh reservations they may have about their role. In other cases, facilitators are unaware and find it difficult to know when they are enabling trafficking to occur. Read more... "